Quote:
Originally Posted by Batalov
And, to warm up,  a small update to CPAP7 (leading to possible CPAP8 and/or CPAP9):
2022541154997*619#+x253+210*n, n=0..6 ( 271 digits)
Don't ask about intermediates. They are all sieved out. But you can check: replace 210* by 2* ...

I have 5 more of these, which I will not report.
I only need ~20 to hit CPAP8.
The pyramid constant for this form with a certain level of sieving is 20.
Pyramid goes like this: you test candidates, 1/20 of them yields hits of 1st order, 1/20
^{2} of them yields hits of 2nd order, etc... (each level is ~1/20)
Currently:
Code:
53367736 ..6937
2664600 ..7147
132644 ..7357
6621 ..7567
309 ..7777
24 ..7987 > 1/20 of these can have a hit at ..6727 (i.e. CPAP7)
1 ..8197 > CPAP7, 1/20 of these can have a hit at ..6727 (i.e. CPAP8)
0 ..8417 > CPAP8, 1/20 of these can have a hit at ..6727 (i.e. CPAP9)